package cn.kailangtu.dataspot;

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.Looper;
import android.os.SystemClock;
import android.util.Log;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import cn.kailangtu.dataspot.activify.SplashActivity;

/**
 * UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告.
 *
 * @author user
 *
 */

public final class CrashHandler implements UncaughtExceptionHandler {

    private volatile static CrashHandler singleton;
    // 用来存储设备信息和异常信息
    private Map<String, String> infos = new HashMap<String, String>();
    // 用于格式化日期,作为日志文件名的一部分
    private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");
    public static final String TAG = "CrashHandler";

    private static CrashHandler getInstance(Context context) {
        if (singleton == null) {
            synchronized (CrashHandler.class) {
                if (singleton == null) {
                    singleton = new CrashHandler(context);
                }
            }
        }
        return singleton;
    }

    public static void active(Context context) {
        Thread.setDefaultUncaughtExceptionHandler(getInstance(context));
    }

    private Context context;

    private CrashHandler(Context context) {
        this.context = context.getApplicationContext();
    }

    @Override
    public void uncaughtException(Thread thread, final Throwable e) {
        new Thread() {
            @Override
            public void run() {
                Looper.prepare();

                Looper.loop();
            }
        }.start();
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e1) {
            e1.printStackTrace();
        }
        // 收集设备参数信息
        collectDeviceInfo(this.context);
        // 保存日志文件
        saveCrashInfo2File(e);
        SystemClock.sleep(5000);


        Intent intent = new Intent(context, SplashActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        Bundle bundle = new Bundle();
        bundle.putSerializable("e", e);
        intent.putExtras(bundle);
        context.startActivity(intent);


        android.os.Process.killProcess(android.os.Process.myPid());
    }

    /**
     * 收集设备参数信息
     *
     * @param ctx
     */
    public void collectDeviceInfo(Context ctx) {
        try {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(),
                    PackageManager.GET_ACTIVITIES);
            if (pi != null) {
                String versionName = pi.versionName == null ? "null"
                        : pi.versionName;
                String versionCode = pi.versionCode + "";
                infos.put("versionName", versionName);
                infos.put("versionCode", versionCode);
            }
        } catch (NameNotFoundException e) {
            Log.e(TAG, "an error occured when collect package info", e);
        }
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                infos.put(field.getName(), field.get(null).toString());
                Log.d(TAG, field.getName() + " : " + field.get(null));
            } catch (Exception e) {
                Log.e(TAG, "an error occured when collect crash info", e);
            }
        }
    }

    /**
     * 保存错误信息到文件中
     *
     * @param ex
     * @return 返回文件名称,便于将文件传送到服务器
     */
    private String saveCrashInfo2File(Throwable ex) {

        StringBuffer sb = new StringBuffer();
        for (Map.Entry<String, String> entry : infos.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            sb.append(key + "=" + value + "\n");
        }

        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        ex.printStackTrace(printWriter);
        Throwable cause = ex.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();
        String result = writer.toString();
        sb.append(result);
        try {
            long timestamp = System.currentTimeMillis();
            String time = formatter.format(new Date());
            String fileName = "crash-" + time + "-" + timestamp + ".log";
            if (Environment.getExternalStorageState().equals(
                    Environment.MEDIA_MOUNTED)) {
                String sdDir = Environment.getExternalStorageDirectory()
                        .getAbsolutePath()
                        + File.separator
                        + "KLTFiles"
                        + File.separator + "log/crash";
                File file = new File(sdDir);
                if (!file.isDirectory()) {
                    boolean mkOk = file.mkdirs();
                    if (!mkOk) {
                        return "";
                    }
                }
                File sdCardDir = new File(sdDir);
                File saveFile = new File(sdCardDir, fileName);
                FileOutputStream outStream = null;
                try {
                    outStream = new FileOutputStream(saveFile, true);
                    outStream.write(sb.toString().getBytes());
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                    return null;
                } finally {
                    outStream.close();
                }
            }
            return fileName;
        } catch (Exception e) {
            Log.e(TAG, "an error occured while writing file...", e);
        }
        return null;
    }
}